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AI robotics, robot learning, embodied AI, and engineering experience of Linji (Joey) Wang
Basics
| Name | Linji (Joey) Wang |
| Label | AI Robotics & Systems Engineer | Curriculum Learning & Embodied RL |
| joewwang@outlook.com | |
| Url | https://linjiw.github.io/ |
| Summary | AI/robotics and systems engineer and Computer Science Ph.D. researcher specializing in automatic curriculum learning, deep reinforcement learning, and embodied-agent training. First/co-first author of two IROS 2025 papers, with systems experience spanning PostgreSQL query performance at AWS and C++/ROS 2 humanoid policy inference. |
Skills
| Robot Learning | |
| Automatic Curriculum Learning | |
| Deep Reinforcement Learning | |
| Teacher–Student Learning | |
| Reward Shaping | |
| PPO | |
| VAE Task Representations | |
| Sim-to-Real |
| Robotics Systems | |
| PyTorch | |
| Isaac Gym | |
| Isaac Lab | |
| MuJoCo | |
| ROS 2 | |
| ONNX Runtime | |
| Navigation | |
| Quadruped Locomotion | |
| Off-Road Mobility | |
| Humanoid Policy Inference |
| Programming | |
| Python | |
| C | |
| C++ | |
| Bash |
| Database Systems | |
| PostgreSQL | |
| Database Internals | |
| Query Processing | |
| Join Optimization | |
| Performance Analysis |
| Software and Experimentation | |
| AWS | |
| Streamlit | |
| Statistical Hypothesis Testing | |
| Docker | |
| Git / CI-CD |
Experience
-
2023.08 - Present Fairfax, VA
Graduate Research Assistant — Robot Learning
RobotiXX Lab, George Mason University
Automatic curriculum learning and deep reinforcement learning for embodied robots, advised by Dr. Xuesu Xiao
- Developed GACL, an automatic curriculum-learning framework using VAE task representations, performance-history tracking, and target-domain grounding; trained PPO agents in 128 parallel Isaac Gym environments and improved success by 6.8% on wheeled navigation and 6.1% on quadruped locomotion versus state-of-the-art methods (first author, IROS 2025)
- Co-developed Reward Training Wheels, a teacher–student framework for proficiency-conditioned auxiliary-reward adaptation; in simulation, improved off-road mobility by 122.62% and reached the same performance threshold 3x faster; sim-trained policies achieved 5/5 physical trials versus 2/5 (co-first author, IROS 2025)
- Third author on Moving Through Clutter (2026), a VR data-collection and evaluation framework for scene-aware humanoid locomotion with 348 trajectories across 145 3D scenes
- Developing a C++/ROS 2 policy-inference stack for Unitree G1 with paired ONNX residual/base policies, metadata-driven observation construction, temporal history, normalization, and Isaac Lab–MuJoCo parity diagnostics
- Co-authored RL-based Adaptive Dynamics Planning (4th author, ICRA 2026) and Decremental Dynamics Planning (3rd author, IROS 2025); the DDP-based RobotiXX system placed 2nd in both the simulation qualifier and physical finals of the 2025 BARN Challenge
-
2026.05 - 2026.08 Software Development Engineer Intern — Amazon Aurora PostgreSQL
Amazon Web Services (AWS)
Aurora PostgreSQL query-execution performance and compatibility
- Contributed to Adaptive Join for Amazon Aurora PostgreSQL, developing mechanisms that adjust join execution to improve query performance
- Worked in the PostgreSQL-based database engine codebase in C on database internals, join processing, performance analysis, and compatibility improvements
-
2025.05 - 2025.08 Bellevue, WA
Software Development Engineer Intern — RDS Proxy
Amazon Web Services (AWS)
Statistical performance testing and visualization infrastructure
- Built a Streamlit application that unified multi-region RDS Proxy performance comparisons and regression investigation
- Implemented regression detection using Welch's t-test, power analysis, and Bonferroni correction; integrated CloudWatch metrics into reproducible performance dashboards
- Developed adaptive test selection with Thompson sampling and Bayesian optimization to prioritize informative test configurations
-
2022.01 - 2023.05 Pittsburgh, PA
Research Assistant — 3D Perception and AR
Computational Engineering and Robotics Lab, Carnegie Mellon University
Deep learning for 3D augmented-reality scene completion
- Built an AR scene-inpainting pipeline using GAN image completion plus RANSAC and DBSCAN point-cloud segmentation
-
2021.09 - 2021.12 Pittsburgh, PA
Research Assistant
Biorobotics Lab, Carnegie Mellon University
Computer vision for recycled-material classification
- Built a CNN and OpenCV pipeline for real-time recycled-paper classification
Education
-
2023.08 - Present Fairfax, VA
Ph.D. in Computer Science
George Mason University
Research focus: curriculum learning and reinforcement learning for robotics
- Advanced Machine Learning
- Deep Learning
- Reinforcement Learning
- Computer Vision
-
2021.09 - 2023.05 Pittsburgh, PA
M.S.
Carnegie Mellon University
Mechanical Engineering
- GPA: 3.94/4.0
- Machine Learning
- Deep Learning
- Computer Vision
- Deep Reinforcement Learning and Control
-
2016.09 - 2021.05 Cincinnati, OH
Publications
-
2026.06.02 Adaptive Dynamics Planning for Robot Navigation
IEEE International Conference on Robotics and Automation (ICRA)
Fourth author. Reinforcement learning adapts dynamics fidelity to environmental complexity for safer, more efficient navigation.
-
2026.03.06 Moving Through Clutter: Scaling Data Collection and Benchmarking for 3D Scene-Aware Humanoid Locomotion via Virtual Reality
arXiv preprint
Third author. VR data-collection and evaluation framework and benchmark for scene-aware humanoid locomotion; 348 trajectories across 145 cluttered 3D scenes.
-
2026.02.01 ColorMap-VIO: A Drift-Free Visual-Inertial Odometry in a Prior Colored Point Cloud Map
IEEE Robotics and Automation Letters (RA-L)
Fifth author. Drift-bounded visual-inertial localization against a prior colored point-cloud map.
-
2025.10.19 Decremental Dynamics Planning for Robot Navigation
IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)
Third author. Dynamics fidelity decreases along the planning horizon; the resulting system placed 2nd in both phases of the 2025 BARN Challenge.
-
2025.10.19 Reward Training Wheels: Adaptive Auxiliary Rewards for Robotics Reinforcement Learning
IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)
Co-first author with Tong Xu. In simulation, adaptive auxiliary rewards achieved 122.62% higher off-road mobility and reached the same performance threshold 3x faster; sim-trained policies achieved 5/5 physical trials versus 2/5.
-
2025.10.19 GACL: Grounded Adaptive Curriculum Learning with Active Task and Performance Monitoring
IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)
First author. Grounded automatic curriculum generation for robotics; 6.8% and 6.1% higher success rates on wheeled navigation and quadruped locomotion than state-of-the-art methods.
-
2025.06.01 II-NVM: Enhancing Map Accuracy and Consistency with Normal Vector-Assisted Mapping
IEEE Robotics and Automation Letters (RA-L)
Fifth author. Normal-vector-consistent SLAM mapping resolves the double-sided mapping issue.
Projects
- 2025.08 - Present
Humanoid Policy Inference Prototype
Ongoing C++/ROS 2 prototype for Unitree G1 motion-policy inference
- Added paired ONNX residual/base inference, metadata-driven observation assembly, history buffering, normalization, and Isaac Lab–MuJoCo parity diagnostics
- Documented validation gates explicitly; no physical-deployment claim is made
Awards
- 2025.05.22
RobotiXX Team — 2nd Place, Simulation and Real-World Phases, 2025 BARN Challenge
IEEE ICRA 2025
Official team result for the DDP-based navigation system.
Teaching
-
2023.08 - 2023.12 -
2022.08 - 2022.12 Teaching Assistant — Artificial Intelligence and Machine Learning
Carnegie Mellon University
Fall 2022
-
2020.08 - 2020.12 Teaching Assistant — System Dynamics, Fluid Dynamics and Engineering Models
University of Cincinnati
Fall 2020
Languages
| English | |
| Fluent |
| Chinese | |
| Native |
Interests
| Embodied AI | |
| Curriculum Learning | |
| Reinforcement Learning | |
| Humanoid Locomotion | |
| Scene-Aware Whole-Body Control |